JBJ 28G Advanced NanoCube Replacement Daylight LED Remote Ballast (for MT-601) JBJ 28 Gallon Advanced Nano Cube Aquarium with LED Lighting (MT-601) Replacement Daylight LED Remote Ballast Part #14 on the exploded view diagram in the JBJ 28 Gallon Nano Cube Advanced Aquarium Manual This is the new version and it may not look like your old ballast. This ballast is marked as Model:MT-601-RB.